<?php

/**
 * OrangeHRM is a comprehensive Human Resource Management (HRM) System that captures
 * all the essential functionalities required for any enterprise.
 * Copyright (C) 2006 OrangeHRM Inc., http://www.orangehrm.com
 *
 * OrangeHRM is free software; you can redistribute it and/or modify it under the terms of
 * the GNU General Public License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * OrangeHRM is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program;
 * if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA  02110-1301, USA
 *
 */

/**
 * Filter cells by given callbacks.
 * 
 * Accepts parameter callback with array of callbacks to apply.
 * eg:
 * 
 *  'filters' => array('CallbackCellFilter' => array('callback' => array('strtolower','ucwords'))),
 */
class CallbackCellFilter extends ohrmCellFilter {
    
    protected $callback;
    public function getCallback() {
        return $this->callback;
    }

    public function setCallback($callback) {
        $this->callback = $callback;
    }
    
    public function filter($value) {
        
        if (empty($this->callback)) {
            throw new ListComponentException('callback property should be set');
        }
        
        if (!is_array($this->callback)) {
            throw new ListComponentException('callback property should be an array');
        }
        
        foreach ($this->callback as $callback) {
        
            if (!is_callable($callback)) {
                throw new ListComponentException('callback is not callable: ' . print_r($this->callback, false));
            }

            $value = call_user_func($callback, $value);
        }

        return $value;
    }
}
